Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Quem era o Democrata quando o Incumbente era Christopher Shays?
 ###Tabelas: CREATE TABLE match-up_summary (match-up_summary_id AUTO_INCREMENT PRIMARY KEY, District INT, Incumbent VARCHAR, 2008 Status VARCHAR, Democratic VARCHAR, Republican VARCHAR, Green VARCHAR) CREATE TABLE federal_election_results (federal_election_results_id AUTO_INCREMENT PRIMARY KEY, Election INT, # of candidates nominated INT, # of seats won INT, # of total votes INT, % of popular vote VARCHAR) CREATE TABLE medal_table_2007-2013 (medal_table_2007-2013_id AUTO_INCREMENT PRIMARY KEY, Rank VARCHAR, Nation VARCHAR, Gold INT, Silver INT, Bronze INT) CREATE TABLE top_appearances_in_uefa_club_competitions (top_appearances_in_uefa_club_competitions_id AUTO_INCREMENT PRIMARY KEY, Rank INT, Player VARCHAR, Games INT, Goals INT, Goal Ratio INT, Debut in Europe INT) CREATE TABLE dzrh_nationwide (dzrh_nationwide_id AUTO_INCREMENT PRIMARY KEY, Branding VARCHAR, Callsign VARCHAR, Frequency VARCHAR, Power (kW) VARCHAR, Station Type VARCHAR, Location VARCHAR)  
SELECT Democratic FROM match-up_summary WHERE Incumbent = christopher shays